You have made previous postings for advice on this subject, and I answered thus:
"I posted this in response to a similar query last month. It worked very successfully for my own kids racing: Create for yourself a chart showing gearing/rpm/mph so you can easily look up the max speed achieved. Always gear to achieve max speed on the fastest straight, you will never need a smaller axle sprocket than this, although very occasionaly on a track with a lot of tight corners it may be beneficial for lap times to add a tooth."
I would be interested to know if you actually tried this, and if so why you feel you still have a gearing problem?
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